Bacteriology

Bacteriology encompasses the study of prokaryotic microorganisms, their physiology, genetics, interactions with hosts and roles in health, disease and the environment. Bacteria display remarkable metabolic diversity, colonising virtually every niche on Earth—from soil and marine sediments to the human body where they form complex microbiomes. Key cellular features include a peptidoglycan cell wall, specialised secretion systems and extracellular appendages such as flagella and pili, which mediate motility and adhesion. Biofilm formation enables multicellular communities to resist antimicrobials and immune clearance, while sophisticated regulatory networks, including two-component systems and quorum sensing, coordinate virulence factor expression and environmental adaptation. Advances in genomics, structural biology and chemical imaging are revealing the mechanistic underpinnings of energy transduction, nutrient cycling and host–pathogen interactions. As antibiotic resistance rises, the field is pivoting towards anti-virulence strategies, phage therapy and exploitation of commensal bacteria to maintain health.

Research from Nature Portfolio

Structural studies of Pseudomonas aeruginosa biofilm enzymes have yielded an anti-biofilm cyclic peptide that locks a secreted aminopeptidase in its inactive conformation. High-resolution crystallography revealed an autoinhibitory propeptide and guided design of a peptide that disrupts nutrient recycling and biofilm maturation in vitro, offering a new class of path-blocking agents. In parallel, cryo-EM and X-ray snapshots of the Na+-pumping NADH:quinone oxidoreductase from Vibrio cholerae captured discrete states of the catalytic cycle. These structures show how redox-driven conformational changes in an intramembranous [2Fe-2S] cluster propagate through the FlhA–FlhB subunits to open and close the sodium-binding chamber, synchronising Na+ release with quinone reduction and suggesting routes to selectively inhibit energy transduction in pathogenic species.

Research from all publishers

Advanced imaging in Pseudomonas biofilms has revealed that clonal cells form lengthwise striations across the community depth, shaping the distribution of nutrients and antibiotic penetrance. Mutants defective in pilus assembly or O-antigen attachment show boundary-restricted substrate access, increased antibiotic susceptibility and altered survival patterns, underscoring the interplay between microanatomy and metabolic heterogeneity. A study in PLOS Pathogens demonstrated that P. aeruginosa senses epithelial potassium efflux via the high-affinity KdpFABC transporter and the KdpDE two-component system. Host-derived K+ currents promote bacterial attachment, microaggregate coalescence and robust biofilm formation on airway surfaces, highlighting ion flux as a cue for colonisation. Complementary proteomic profiling in urine-like media identified respiratory complex III, NQR and succinate dehydrogenase as primary bioenergetic enzymes in stationary-phase cells, suggesting NQR as a target for multidrug-resistant urinary tract infections.

Bacteriology publication trend

The graph below shows the total number of articles in bacteriology across all publications each year (not limited to Nature Index journals).

Technical terms

Biofilm: A structured community of bacterial cells embedded in a self-produced extracellular polymeric matrix that adheres to surfaces and confers resistance to antimicrobials.

Quorum sensing: A bacterial cell-to-cell communication mechanism in which the accumulation of signalling molecules coordinates collective behaviours, including virulence factor production.

Aminopeptidase: An enzyme that cleaves amino acids from the N-terminus of peptides and proteins, contributing to nutrient acquisition and modulation of biofilm structure.

Na+-pumping NADH:quinone oxidoreductase (NQR): A membrane-embedded enzyme complex that couples NADH oxidation to quinone reduction with Na+ translocation, generating an electrochemical gradient.

KdpFABC transporter: A high-affinity potassium uptake system and its regulatory two-component sensor (KdpDE) that enables bacteria to detect and respond to host-derived K+ fluxes.

Cryo-electron microscopy: An imaging technique that captures macromolecular structures at near-atomic resolution under cryogenic conditions, preserving native conformations.

References

1. An anti-biofilm cyclic peptide targets a secreted aminopeptidase from P. aeruginosa. Nature Chemical Biology (2023).
2. Conformational coupling of redox-driven Na+-translocation in Vibrio cholerae NADH:quinone oxidoreductase. Nature Structural & Molecular Biology (2023).
3. Cellular arrangement impacts metabolic activity and antibiotic tolerance in Pseudomonas aeruginosa biofilms.. PLOS Biology (2024).
4. Pseudomonas aeruginosa senses and responds to epithelial potassium flux via Kdp operon to promote biofilm. PLOS Pathogens (2024).
5. Identification of complex III, NQR, and SDH as primary bioenergetic enzymes during the stationary phase of Pseudomonas aeruginosa cultured in urine-like conditions. Frontiers in Microbiology (2024).
6. Bacteriology.